// Change the window's icon
func (wi *windowInternal) setIcon(icon image.Image) error {
// First destroy the previous one
if wi.icon != nil {
C.DestroyIcon(wi.icon)
}
type BGRA [4]uint8
// Windows wants BGRA pixels: swap red and blue channels
Rect := icon.Bounds()
iconPixels := make([]BGRA, Rect.Dy()*Rect.Dx())
for i, y := 0, 0; y < Rect.Dy(); y++ {
for x := 0; x < Rect.Dx(); x++ {
r, g, b, a := icon.At(x, y).RGBA()
iconPixels[i][0] = uint8(b)
iconPixels[i][1] = uint8(g)
iconPixels[i][2] = uint8(r)
iconPixels[i][3] = uint8(a)
}
}
// Create the icon from the pixel array
width, height := C.int(Rect.Dx()), C.int(Rect.Dy())
wi.icon = C.CreateIcon(C.GetModuleHandle(nil), width, height, 1, 32, nil, (*C.BYTE)(&iconPixels[0][0]))
if wi.icon == nil {
return fmt.Errorf("could not create icon (%d)", C.GetLastError())
}
C.SendMessage(wi.window.Handle, C.WM_SETICON, C.ICON_BIG, C.LPARAM(uintptr(unsafe.Pointer(wi.icon))))
C.SendMessage(wi.window.Handle, C.WM_SETICON, C.ICON_SMALL, C.LPARAM(uintptr(unsafe.Pointer(wi.icon))))
return nil
}
func (window *Win32Window) Create(width uint, height uint, title string) bool {
hInstance := C.GetModuleHandle(nil)
if hInstance == nil {
fmt.Println("Error")
return false
}
res := C.RegisterWindow(C.CString("WindowClass"), hInstance, (C.WNDPROC)(unsafe.Pointer(syscall.NewCallback(func(hwnd C.HWND, message C.UINT, wParam C.WPARAM, lparam C.LPARAM) C.LRESULT {
return window.WndProc(hwnd, message, wParam, lparam)
}))))
if res == 0 {
fmt.Println("ERRRROR")
}
hwnd := C.CreateWindowTest(C.CString("WindowClass"), C.CString(title), (C.UINT)(width), (C.UINT)(height), hInstance)
window.width = width
window.height = height
window.hInstance = hInstance
window.hwnd = hwnd
C.ShowWindow(hwnd, C.SW_SHOW)
return true
}
func createHiddenWindow(width, height int) C.HWND {
window := C.CreateWindowExW(0, contextInternal_className, contextInternal_wTitle, C.WS_POPUP|C.WS_DISABLED, 0, 0, C.int(width), C.int(height), nil, nil, C.GetModuleHandle(nil), nil)
if window == nil {
return nil
}
C.ShowWindow(window, C.SW_HIDE)
return window
}
// #include "helper_windows.h"
//
// extern LRESULT CALLBACK (*pGlobalOnEvent)(HWND handle, UINT message, WPARAM wParam, LPARAM lParam);
import "C"
import (
"fmt"
"image"
"unsafe"
)
var className, classNameLength = utf16Convert("go-glml/window.Window")
var windowClass = C.WNDCLASSW{
lpfnWndProc: C.pGlobalOnEvent,
style: C.CS_OWNDC | C.CS_HREDRAW | C.CS_VREDRAW,
hInstance: C.HINSTANCE(C.GetModuleHandle(nil)),
lpszClassName: className,
}
func init() {
C.RegisterClassW(&windowClass)
}
type WindowHandle struct {
Handle C.HWND
}
func (wh WindowHandle) IsValid() bool {
return wh.Handle != nil
}